Coating removing device, coating removing method, and motor

Abstract

To provide a coating removing device capable of suppressing deterioration of a removing accuracy while efficiently removing an insulation coating.SOLUTION: In a coating removing device having a punch and a die, a blade tip part 22 of a blade body 21 of a punch includes: a first cutting start part 23 to which a blade tip end is inclined to a wide direction W in view of a thickness direction; a second cutting start part 24; at least one of first blade tip inclination parts 25; and at least one of second blade tip inclination parts 26. The first cutting start part and the first blade tip inclination part are arranged in order so as to be directed to the other end part W2 from a one end part W1 of the width direction. The second cutting start part and the second blade tip inclination part are arranged in order toward the one end part from the other end part of the width direction, and an inclination angle of the blade tip end of the first cutting start part to the width direction in view of the thickness direction of the blade body is smaller than the inclination angle of the blade tip end of the first blade tip inclination part to the width direction. The inclination angle of the blade tip end of the second cutting start part to the width direction is smaller than the inclination angle of the blade tip end of the second blade tip inclination part to the width direction.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a film removing device, a film removing method, and a motor.

Background Art

[0002] There is known a film removing device for removing an insulating film of a conducting wire. As such a device, there is disclosed a film peeling device that peels a film on a side surface of a flat wire disposed between a punch and a die by moving a punch including a pair of peeling blades extending parallel to each other toward the die to cut the side surface of the flat wire (for example, Patent Document 1). In the film peeling device, the cutting edges of the pair of peeling blades are formed in a concave shape that is symmetrically recessed from the central portion toward both end portions.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By inclining the tip of the cutting edge of the plate-shaped blade body in the width direction as in the film peeling device, the area of the tip of the cutting edge in contact with the conducting wire can be reduced. Thereby, the removal accuracy of the insulating film can be improved.

[0005] On the other hand, when removing the insulating film of the conducting wire with a blade body having a cutting edge tip inclined in the width direction, compared with a blade body having a cutting edge tip parallel to the width direction, it is necessary to increase the moving distance for moving the blade body with respect to the conducting wire. Therefore, the time required for removing the insulating film becomes long, and the working efficiency decreases.

[0006] Further, in the blade body having a blade tip end inclined with respect to the width direction, the portion of the blade tip end that first contacts the conductive wire receives a reaction force from the conductive wire and is more likely to wear compared to other portions. Therefore, at the boundary portion between the portion having the insulating film and the portion where the insulating film is removed in the conductive wire, the removal accuracy of the insulating film is likely to decrease. Thus, there is a need for a film removal device that can efficiently remove the insulating film and suppress a decrease in the removal accuracy of the insulating film.

[0007] An object of the present invention is to provide a film removal device that can efficiently remove an insulating film and suppress a decrease in the removal accuracy of the insulating film.

Means for Solving the Problems

[0008] A film removal device according to an embodiment of the present invention is a film removal device that removes an insulating film on a side surface of a conductive wire by a punch including a blade body and a die. The punch is movable toward the die. The blade body is plate-shaped and has a blade tip portion at a front end in the moving direction of the punch. The blade tip portion has a first cut start portion, a second cut start portion, at least one first blade tip inclination portion, and at least one second blade tip inclination portion, where the blade tip ends are inclined with respect to the width direction of the blade body when the blade body is viewed in the thickness direction. The first cut start portion and the first blade tip inclination portion are arranged in order from one end portion to the other end portion in the width direction of the blade tip portion. The second cut start portion and the second blade tip inclination portion are arranged in order from the other end portion to the one end portion in the width direction of the blade tip portion. When the blade body is viewed in the thickness direction, the inclination angle of the blade tip end of the first cut start portion with respect to the width direction is smaller than the inclination angle of the blade tip end of the first blade tip inclination portion with respect to the width direction. When the blade body is viewed in the thickness direction, the inclination angle of the blade tip end of the second cut start portion with respect to the width direction is smaller than the inclination angle of the blade tip end of the second blade tip inclination portion with respect to the width direction.

[0009] The film removal method according to an embodiment of the present invention is a film removal method for removing an insulating film on the side surface of a conducting wire by the film removal device. The film removal method includes a positioning step of positioning the conducting wire by the positioning portion of the die so that the tip portion of the blade body of the punch overlaps the conductor of the conducting wire when viewed in the moving direction of the punch, and an insulating film removal step of removing a predetermined range of the insulating film on the side surface of the conducting wire by the tip portion by moving the punch toward the die. The insulating film removal step includes a first cut start step of forming a boundary at one end in the longitudinal direction of the side surface of the conducting wire in the predetermined range by the first cut start portion of the tip portion, a second cut start step of forming a boundary at the other end in the longitudinal direction of the side surface of the conducting wire in the predetermined range by the second cut start portion of the tip portion, a first insulating film removal step of removing a portion of the insulating film in the predetermined range that is located on the boundary side of the other end rather than the one end by the first blade tip inclined portion of the tip portion, and a second insulating film removal step of removing a portion of the insulating film in the predetermined range that is located on the boundary side of the one end rather than the other end by the second blade tip inclined portion of the tip portion.

[0010] A motor according to an embodiment of the present invention includes a stator core having a plurality of slots extending in the axial direction, a conductor, and an insulating film covering the conductor, and a plurality of conducting wires partially accommodated in the plurality of slots. The motor also includes a stator and a rotor that rotates about the axis of the stator. The conducting wire has a covered portion where the conductor is covered by the insulating film, an exposed portion where the conductor is exposed, and a stepped portion located between the covered portion and the exposed portion. The boundary portion between the stepped portion and the covered portion extends linearly in a direction orthogonal to the extending direction of the conducting wire.

Advantages of the Invention

[0011] According to an embodiment of the present invention, it is possible to provide a film removal device that can efficiently remove the insulating film of a conducting wire and suppress a decrease in the removal accuracy of the insulating film.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9A

Figure 9B

Figure 10A

Figure 10B

Figure 10C

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

MODE FOR CARRYING OUT THE INVENTION

[0013] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and their descriptions will not be repeated. Also, the dimensions of the constituent members in each figure do not faithfully represent the dimensions of the actual constituent members and the dimensional ratios of the respective constituent members.

[0014] Also, in the following description, expressions such as "fix", "connect", and "attach" (hereinafter, "fix" etc.) include not only cases where members are directly fixed etc., but also cases where they are fixed etc. via other members. That is, in the following description, the expressions of "fix" etc. include the meanings of direct and indirect fixing etc. of members to each other.

[0015] (Embodiment 1) (Configuration of Film Removal Device) With reference to FIGS. 1 to 9B, the film removal device 1 according to an exemplary embodiment of the present invention will be described. The film removal device 1 is a device for removing the insulating film 52 that covers the side surface of the conducting wire 50. The conducting wire 50 is used, for example, for the stator coil of a motor.

[0016] First, the lead wire 50 will be briefly described with reference to FIG. 1. As shown in FIG. 1, the lead wire 50 has a conductor 51 and an insulating film 52. The lead wire 50 is, for example, a flat wire. That is, the conductor 51 before the insulating film is removed by the film removing device 1 is rectangular when viewed in a cross-section orthogonal to the stretching direction. The insulating film 52 covers the side surface of the conductor 51. The insulating film 52 is formed, for example, by applying an insulating resin to the outer peripheral surface of the conductor 51 and baking it. Note that the lead wire may be a round wire, a square wire, or the like.

[0017] The lead wire 50 has a covered portion 61 whose side surface is covered by the insulating film 52 and an exposed portion 62 whose side surface is exposed without being covered by the insulating film 52. The lead wire 50 is insulated in the covered portion 61 covered by the insulating film 52. The lead wire 50 is not insulated in the exposed portion 62 where the conductor 51 is exposed. For example, in the lead wire 50 used in a motor, the insulating film 52 is removed at the wire end portion 50a. A plurality of lead wires 50 are electrically connected by welding or the like between the wire end portions 50a.

[0018] The exposed portion 62 is formed by cutting, with the film removing device 1, a side surface in a predetermined range in the stretching direction of the lead wire 50 in which the insulating film 52 is formed on the side surface. Therefore, the lead wire 50 has a stepped portion 63 between the covered portion 61 and the exposed portion 62.

[0019] The outer peripheral surface of the stepped portion 63 is composed of an inclined surface that is inclined with respect to the stretching direction of the lead wire 50. The boundary portion 61a between the stepped portion 63 and the covered portion 61 extends linearly in a direction orthogonal to the stretching direction of the lead wire 50.

[0020] The wire end portion 50a of the lead wire 50 is obtained by cutting the exposed portion 62 of the lead wire 50 formed by the film removing device 1 at the central portion in the stretching direction of the lead wire 50.

[0021] (Description of the configuration of the die and the punch) Next, an exemplary film removal device 1 according to the present embodiment will be described with reference to FIGS. 2 to 9B. The film removal device 1 is a device for removing an insulating film 52 that covers the side surface of a conducting wire 50.

[0022] As shown in FIGS. 2 and 3, the film removal device 1 includes a punch 2 and a die 3. The punch 2 moves from a position away from the die 3 toward the die 3. By moving toward the die 3, the punch 2 comes into contact with the conducting wire 50 placed on the base 3a of the die 3 and removes the insulating film 52 that covers the side surface of the conducting wire 50. In the following description, the front in the moving direction Z of the punch 2 means the direction in which the punch 2 moves toward the conducting wire 50 placed on the base 3a of the die 3.

[0023] The punch 2 has a pair of blade bodies 21. The pair of blade bodies 21 are each plate-shaped. The pair of blade bodies 21 are arranged side by side in the thickness direction. The pair of blade bodies 21 are arranged in parallel with a gap therebetween. The blade body 21 has a blade tip portion 22 at the front end on the front side in the moving direction Z. The detailed configuration of the blade tip portion 22 will be described later.

[0024] As shown in FIG. 4, in the present embodiment, when the blade body 21 is viewed in the moving direction Z, the blade body 21 has an inclined surface 21b at the connection portion between one surface 21a in the thickness direction and the end surfaces on both sides in the width direction W. The blade body 21 has a blade tip at the corner between one surface 21a in the thickness direction and the front end surface in the moving direction Z, and at the corner between the inclined surface 21b and the front end surface in the moving direction Z. As shown in FIG. 2, the surfaces 21a of the pair of blade bodies 21 face each other.

[0025] As shown in FIGS. 3 and 5, in the present embodiment, when the die 3 is viewed in the moving direction Z of the punch 2, the die 3 is long in a direction intersecting the arrangement direction of the pair of blade bodies 21. On the base 3a of the die 3, the conducting wire 50 is placed in a posture such that the extending direction of the conducting wire 50 is perpendicular to the moving direction Z of the punch 2 and coincides with the width direction W of the blade body 21 of the punch 2.

[0026] As shown in FIGS. 2 and 3, when viewed in the moving direction Z of the punch 2, both side portions of the conducting wire 50 placed on the base 3a in the said posture overlap with a pair of blade bodies 21. That is, the conducting wire 50 is positioned at a position where a pair of blade bodies 21 overlap with both side portions in the short side direction of the conducting wire 50 when viewed in the moving direction Z of the punch 2.

[0027] Note that the base 3a of the die 3 does not have to be a plane parallel to the ground. The base of the die may be a plane inclined with respect to the ground or a plane perpendicular to the ground. The base of the die may have irregularities. In FIG. 5, the position of the conducting wire 50 with respect to the die 3 is shown by a two-dot chain line.

[0028] As shown in FIGS. 2 and 3, the die 3 has a pair of insertion holes 32 extending in the moving direction Z of the punch 2. The pair of insertion holes 32 are located on both sides in the width direction of the conducting wire 50 with respect to the conducting wire 50 placed on the base 3a when viewed in the moving direction Z. As shown in FIG. 6, the insertion hole 32 is inserted with the blade tip portion 22 of the punch 2 that has moved forward in the moving direction Z.

[0029] When the punch 2 moves forward in the moving direction Z, the pair of blade bodies 21 cut both side portions of the conducting wire 50. That is, a range R of the insulating film 52 on the side surface of the conducting wire 50 that overlaps with the pair of blade bodies 21 when viewed in the moving direction Z is removed by the pair of blade bodies 21.

[0030] In the present embodiment, the die 3 has a positioning portion 31 for positioning the conducting wire 50. The positioning portion 31 is, for example, a groove portion 31a that the base 3a of the die 3 has. The groove portion 31a extends in the longitudinal direction of the die 3. The conducting wire 50 is inserted into the groove portion 31a. Thereby, the conducting wire 50 can be easily positioned at a predetermined position on the base 3a.

[0031] FIG. 7 is a view of the conducting wire 50 positioned on the base 3a of the die 3 and a pair of blade bodies 21 of the punch 2 when viewed in the moving direction Z. In the present embodiment, the positioning portion 31 positions the conducting wire 50 at a position where the blade tip portion 22 of the punch 2 overlaps with the conductor 51 of the conducting wire 50 when viewed in the moving direction Z.

[0032] Therefore, as the punch 2 moves forward in the moving direction Z, a part of the insulating film 52 and the conductor 51 included in the portion of the conducting wire 50 that overlaps with the pair of blade bodies 21 when viewed in the moving direction Z is removed. Thus, the film removing device 1 removes not only the insulating film 52 but also a part of the conductor 51 from the conducting wire 50. Thereby, the insulating film 52 can be removed more reliably by the film removing device 1.

[0033] (Shape of the blade tip part) The shape of the exemplary blade tip part 22 according to the present embodiment will be described in detail with reference to FIGS. 8 to 9B.

[0034] In the present embodiment, the blade tip part 22 has a first cut start part 23, a second cut start part 24, two first blade tip inclined parts 25, and two second blade tip inclined parts 26. In the present embodiment, from one end part W1 to the other end part W2 in the width direction W of the blade body 21, the first cut start part 23, one first blade tip inclined part 25, one second blade tip inclined part 26, one first blade tip inclined part 25, one second blade tip inclined part 26, and the second cut start part 24 are arranged in this order.

[0035] As shown in FIG. 9A, the blade tip 23a of the first cut start part 23 is inclined with respect to the width direction W. One end part W1 side of the blade tip 23a of the first cut start part 23 is located on the front side in the moving direction Z than the other end part W2 side.

[0036] The blade tip 25a of the first blade tip inclined part 25 is inclined with respect to the width direction W of the blade body 21. One end part W1 side of the blade tip 25a of the first blade tip inclined part 25 is located on the front side in the moving direction Z than the other end part W2 side.

[0037] The inclination angle D23 of the blade tip 23a of the first cut start part 23 with respect to the width direction W is smaller than the inclination angle D25 of the blade tip 25a of the first blade tip inclined part 25 with respect to the width direction W. The inclination angle D23 is, for example, 20 degrees. The inclination angle D25 is, for example, 45 degrees.

[0038] As shown in FIG. 9B, the cutting edge tip 24a of the second cut start portion 24 is inclined with respect to the width direction W. The other end portion W2 side of the cutting edge tip 24a of the second cut start portion 24 is located on the front side in the moving direction Z than the one end portion W1 side.

[0039] The cutting edge tip 26a of the second cutting edge inclined portion 26 is inclined with respect to the width direction W. The other end portion W2 side of the cutting edge tip 26a of the second cutting edge inclined portion 26 is located on the front side in the moving direction Z than the one end portion W1 side.

[0040] The inclination angle D24 of the cutting edge tip 24a of the second cut start portion 24 with respect to the width direction W is smaller than the inclination angle D26 of the cutting edge tip 26a of the second cutting edge inclined portion 26 with respect to the width direction W. The inclination angle D24 is, for example, 20 degrees. The inclination angle D26 is, for example, 45 degrees.

[0041] As shown in FIG. 8, in the present embodiment, the length in the width direction W of the first cut start portion 23 is shorter than the length in the width direction W of the first cutting edge inclined portion 25. The length in the width direction W of the second cut start portion 24 is shorter than the length in the width direction W of the second cutting edge inclined portion 26.

[0042] The film removal device 1 according to the present embodiment described above is a film removal device 1 that removes the insulating film 52 on the side surface of the conductive wire 50 by the punch 2 including the blade body 21 and the die 3. The punch 2 is movable toward the die 3. The blade body 21 is plate-shaped and has a blade tip portion 22 at the front end portion in the moving direction Z of the punch 2. The blade tip portion 22 has a first cut start portion 23, a second cut start portion 24, at least one first blade tip inclined portion 25, and at least one second blade tip inclined portion 26, where the blade tip tips 23a, 24a, 25a, 26a are inclined with respect to the width direction W of the blade body 21 when the blade body 21 is viewed in the thickness direction. The first cut start portion 23 and the first blade tip inclined portion 25 are arranged in order from one end portion W1 to the other end portion W2 in the width direction W of the blade tip portion 22. The second cut start portion 24 and the second blade tip inclined portion 26 are arranged in order from the other end portion W2 to the one end portion W1 in the width direction W of the blade tip portion 22. When the blade body 21 is viewed in the thickness direction, the inclination angle D23 of the blade tip tip 23a of the first cut start portion 23 with respect to the width direction W is smaller than the inclination angle D25 of the blade tip tip 25a of the first blade tip inclined portion 25 with respect to the width direction W. When the blade body 21 is viewed in the thickness direction, the inclination angle D24 of the blade tip tip 24a of the second cut start portion 24 with respect to the width direction W is smaller than the inclination angle D26 of the blade tip tip 26a of the second blade tip inclined portion 26 with respect to the width direction W.

[0043] In the film removing device 1 having the above configuration, at one end W1 in the width direction W of the cutting edge portion 22, one end W1 side of the first cutting start portion 23 protrudes toward the die 3 side. As a result, when the punch 2 moves toward the die 3, a cut is formed in the insulating film 52 on the side surface of the conductive wire 50 by the cutting edge tip 23a of the first cutting start portion 23. At the other end W2 in the width direction W of the cutting edge portion 22, the other end W2 side of the second cutting start portion 24 protrudes toward the die 3 side. As a result, when the punch 2 moves toward the die 3, a cut is formed in the insulating film 52 on the side surface of the conductive wire 50 by the cutting edge tip 24a of the second cutting start portion 24. The cut formed by the first cutting start portion 23 becomes one longitudinal boundary R1 in the range R of the insulating film 52 to be removed from the conductive wire 50. The cut formed by the second cutting start portion 24 becomes the other longitudinal boundary R2 in the range R of the insulating film 52 to be removed from the conductive wire 50.

[0044] Also, the insulating film 52 on the side of the other boundary R2 rather than the one boundary R1 is removed by the cutting edge tip 23a of the first cutting start portion 23 and the cutting edge tip 25a of the first cutting edge inclined portion 25 adjacent to the first cutting start portion 23 in the width direction W. The insulating film 52 on the side of the one boundary R1 rather than the other boundary R2 is removed by the cutting edge tip 24a of the second cutting start portion 24 and the cutting edge tip 26a of the second cutting edge inclined portion 26 adjacent to the second cutting start portion 24 in the width direction W. Thereby, the insulating film 52 can be efficiently removed without increasing the moving distance of the punch 2.

[0045] Moreover, the inclination angle D23 of the cutting edge tip 23a of the first cut start portion 23 with respect to the width direction W is smaller than the inclination angle D25 of the cutting edge tip 25a of the first cutting edge inclined portion 25 with respect to the width direction W. Thereby, when the cutting edge tip 23a of the first cut start portion 23 and the cutting edge tip 24a of the second cut start portion 24 form one boundary R1 and the other boundary R2, the reaction force received from the insulating film 52 can be reduced. Therefore, wear or deformation of the cutting edge tip 23a of the cutting edge portion 22 can be suppressed. Accordingly, it is possible to suppress a decrease in the removal accuracy of the insulating film 52 at the boundaries R1 and R2 due to wear or the like of the cutting edge tip 23a.

[0046] Therefore, it is possible to provide the film removing device 1 that can efficiently remove the insulating film 52 and suppress a decrease in the removal accuracy of the insulating film 52.

[0047] In the present embodiment, the length of the first cut start portion 23 in the width direction W is shorter than the length of the first cutting edge inclined portion 25 in the width direction W. The length of the second cut start portion 24 in the width direction W is shorter than the length of the second cutting edge inclined portion 26 in the width direction W.

[0048] The blade body having a cutting edge tip inclined with respect to the width direction W cuts the object to be cut in the moving direction of the blade body and also cuts in the width direction of the blade body. Therefore, the blade body with a larger inclination angle of the cutting edge tip with respect to the width direction can cut the object to be cut with a smaller force. Therefore, the blade body with a larger inclination angle has higher cutting accuracy.

[0049] Therefore, the first cutting start portion 23 where the inclination angle D23 of the cutting edge tip 23a with respect to the width direction W of the blade body 21 is smaller than the inclination angle D25 in the first cutting edge inclination portion 25 has a lower removal accuracy of the insulating film 52 than the first cutting edge inclination portion 25. The second cutting start portion 24 where the inclination angle D24 of the cutting edge tip 24a with respect to the width direction W of the blade body 21 is smaller than the inclination angle D26 in the second cutting edge inclination portion 26 has a lower removal accuracy of the insulating film 52 than the second cutting edge inclination portion 26. In the present embodiment, the range of the insulating film 52 removed by the first cutting start portion 23 and the second cutting start portion 24 is smaller than the range of the insulating film 52 removed by the first cutting edge inclination portion 25 and the second cutting edge inclination portion 26. Therefore, the range where the removal accuracy decreases is small. Thereby, it is possible to suppress a decrease in the removal accuracy of the insulating film 52.

[0050] In the present embodiment, when the blade body 21 is viewed in the thickness direction, the cutting edge tip 23a of the first cutting start portion 23 is inclined with respect to the width direction W. When the blade body 21 is viewed in the thickness direction, the cutting edge tip 25a of the first cutting edge inclination portion 25 is inclined at an angle of 45 degrees or more with respect to the width direction W. When the blade body 21 is viewed in the thickness direction, the cutting edge tip 24a of the second cutting start portion 24 is inclined with respect to the width direction W. When the blade body 21 is viewed in the thickness direction, the cutting edge tip 26a of the second cutting edge inclination portion 26 is inclined at an angle of 45 degrees or more with respect to the width direction W.

[0051] Thereby, it is possible to provide a configuration capable of starting to cut the insulating film 52 with a smaller force than when the inclination angles of the cutting edge tips 23a and 24a of the first cutting start portion 23 and the second cutting start portion 24 with respect to the width direction W are 0 degrees. Further, wear of the cutting edge tips 23a and 24a in the first cutting start portion 23 and the second cutting start portion 24 can be suppressed.

[0052] Further, by setting the inclination angle D25 of the first cutting edge inclination portion 25 and the inclination angle D26 of the second cutting edge inclination portion 26 to 45 degrees or more, it is possible to suppress an increase in the speed of removing the insulating film 52 in the width direction W with respect to the moving speed of the punch 2. Thereby, it is possible to suppress a decrease in the removal accuracy of the insulating film 52.

[0053] In this embodiment, the cutting edge portion 22 has other first cutting edge inclined portions 25 and other second cutting edge inclined portions 26 that are alternately arranged in the width direction W between a first cutting edge inclined portion 25 adjacent to the first cutting start portion 23 in the width direction W and a second cutting edge inclined portion 26 adjacent to the second cutting start portion 24 in the width direction W.

[0054] Thereby, the distance that the punch 2 moves in the moving direction Z to remove the insulating film 52 can be reduced. Therefore, it is possible to efficiently remove the insulating film 52 and provide a configuration capable of suppressing a decrease in the removal accuracy of the insulating film 52.

[0055] (Film removal method by a film removal device) Next, with reference to FIGS. 8 and 10A to 13, a film removal method according to an exemplary embodiment of the present invention will be described. The film removal method is a method of removing the insulating film 52 on the side surface of the conductive wire 50 by the film removal device 1 having the above-described configuration. In FIGS. 10A to 10C, for the sake of explanation, the portion of the conductive wire 50 from which the insulating film 52 has been removed is hatched.

[0056] The film removal method includes a positioning step S1 and an insulating film removal step S2.

[0057] The positioning step S1 is a step of positioning the conductive wire 50 on the die 3. In this embodiment, the positioning portion 31 of the die 3 positions the conductive wire 50 at a position where the cutting edge portion 22 of the blade body 21 of the punch 2 overlaps the conductor 51 of the conductive wire 50 as viewed in the moving direction Z of the punch 2.

[0058] The insulating film removal step S2 is a step of removing the insulating film 52 on the side surface of the conductive wire 50. Specifically, in the insulating film removal step S2, by moving the punch 2 toward the die 3, the cutting edge portion 22 removes the insulating film 52 included in the range R of the insulating film 52 on the side surface of the conductive wire 50.

[0059] Specifically, the insulating film removal step S2 includes a first cut start step S21, a second cut start step S22, a first insulating film removal step S23, and a second insulating film removal step S24.

[0060] In this embodiment, as shown in FIG. 8, the cutting edge tip of the cutting edge portion 22 has the one end portion W1 side of the first cut start portion 23 and the other end portion W2 side of the second cut start portion 24 protruding most toward the die 3. Therefore, as shown in FIG. 10A, when the punch 2 is moved forward in the moving direction Z, the cutting edge tip 23a of the first cut start portion 23 and the cutting edge tip 24a of the second cut start portion 24 first come into contact with the conductive wire 50. Thus, cuts are formed at the boundaries R1 and R2 of the range R where the insulating film 52 on the conductive wire 50 is to be removed.

[0061] That is, the first cut start portion 23 forms the boundary R1 at one longitudinal end of the side surface of the conductive wire 50 in the range R. This step is the first cut start step S21. The second cut start portion 24 forms the boundary R2 at the other longitudinal end of the side surface of the conductive wire 50 in the range R. This step is the second cut start step S22.

[0062] When the punch 2 is further moved forward in the moving direction Z, as shown in FIG. 10B, the insulating film 52 in the range R is removed toward the moving direction Z by the cutting edge tip 23a of the first cut start portion 23 and the cutting edge tip 25a of the first cutting edge inclined portion 25, and is removed from the one end portion W1 side toward the other end portion W2 side. The insulating film 52 in the range R is removed toward the moving direction Z by the cutting edge tip 24a of the second cut start portion 24 and the cutting edge tip 26a of the second cutting edge inclined portion 26, and is removed from the other end portion W2 side toward the one end portion W1 side.

[0063] When the punch 2 is further moved forward in the moving direction Z, as shown in FIG. 10C, the insulating film 52 within the range R is removed. Thereby, an exposed portion 62 where the conductor 51 is exposed on the conductive wire 50 and a step portion 63 located between the covering portion 61 and the exposed portion 62 are formed.

[0064] That is, the first cutting edge inclined portion 25 removes the portion of the insulating film 52 located on the boundary R2 side of the other end rather than the boundary R1 of one end in the range R. This process is the first insulating film removing step S23. The second cutting edge inclined portion 26 removes the portion of the insulating film 52 located on the boundary R1 side of one end rather than the boundary R2 of the other end in the range R. This process is the second insulating film removing step S24.

[0065] Thus, in this embodiment, the cutting edge portion 22 makes incisions at the boundaries R1 and R2 of the range R and simultaneously removes a plurality of portions of the insulating film 52 within the range R. Thereby, the insulating film 52 can be efficiently removed by the cutting edge portion 22.

[0066] As described above, in this embodiment, when the blade body 21 is viewed in the moving direction Z, the blade body 21 has an inclined surface 21b at the connection portion between one surface 21a in the thickness direction and the end surfaces on both sides in the width direction W. Therefore, as shown in FIGS. 11 to 13, when the conductor 50 with the insulating film 52 removed within the range R is viewed in the moving direction Z of the punch 2, the stepped portion 63 of the conductor 50 is inclined with respect to the extending direction of the conductor 50. In this embodiment, the stepped portion 63 is formed by the first incision starting portion 23 and the second incision starting portion 24 of the cutting edge portion 22.

[0067] That is, in this embodiment, the boundary portion between the stepped portion 63 and the covering portion 61 is formed by the cutting edge tip 23a of the first incision starting portion 23 and the cutting edge tip 24a of the second incision starting portion 24 that are inclined with respect to the width direction W when the blade body 21 is viewed in the thickness direction. Therefore, a planar stepped portion 63 can be formed in the moving direction of the blade body 21. Accordingly, a conductor 50 in which the boundary portion 61a between the stepped portion 63 and the covering portion 61 extends linearly in a direction orthogonal to the extending direction of the conductor 50 can be formed.

[0068] As described above, the exemplary film removal method according to the present embodiment is a film removal method for removing the insulating film 52 on the side surface of the conductive wire 50 by the film removal apparatus 1. The film removal method includes a positioning step S1 and an insulating film removal step S2. In the positioning step S1, the positioning portion 31 of the die 3 positions the conductive wire 50 such that the cutting edge portion 22 of the cutting blade 21 of the punch 2 overlaps with the conductor 51 of the conductive wire 50 as viewed in the moving direction Z of the punch 2. In the insulating film removal step S2, the punch 2 is moved toward the die 3, and the cutting edge portion 22 removes the insulating film 52 in the range R of the insulating film 52 on the side surface of the conductive wire 50.

[0069] The insulating film removal step S2 includes a first cut start step S21, a second cut start step S22, a first insulating film removal step S23, and a second insulating film removal step S24. In the first cut start step S21, the first cut start portion 23 of the cutting edge portion 22 forms a boundary R1 at one end in the longitudinal direction of the side surface of the conductive wire 50 in the range R. In the second cut start step S22, the second cut start portion 24 of the cutting edge portion 22 forms a boundary R2 at the other end in the longitudinal direction of the side surface of the conductive wire 50 in the range R. In the first insulating film removal step S23, the first cutting edge inclined portion 25 of the cutting edge portion 22 removes the portion of the insulating film 52 in the range R that is located on the side of the boundary R2 at the other end rather than the boundary R1 at one end. In the second insulating film removal step S24, the second cutting edge inclined portion 26 of the cutting edge portion 22 removes the portion of the insulating film 52 in the range R that is located on the side of the boundary R1 at one end rather than the boundary R2 at the other end.

[0070] Thereby, among the insulating films 52 covering the side surface of the conductive wire 50, the insulating film 52 within the range R to be removed can be removed from the boundary R1 at one end in the longitudinal direction of the range R toward the boundary R2 at the other end, and also from the boundary R2 at the other end toward the boundary R1 at one end. Therefore, it is possible to provide a film removal method capable of efficiently removing the insulating film 52 and suppressing a decrease in the removal accuracy of the insulating film 52.

[0071] (Modification of Embodiment 1) The shape of the cutting edge portion 22 of Embodiment 1 is an example. The cutting edge portion may have other shapes as long as it has a first cut start portion, a second cut start portion, a first cutting edge inclined portion, and a second cutting edge inclined portion, in which the cutting edge tip inclines with respect to the width direction of the blade body when viewed in the thickness direction of the blade body.

[0072] For example, as shown in FIG. 14, the blade body 121 may have a cutting edge portion 122 in which a first cut start portion 23, one first cutting edge inclined portion 25, one second cutting edge inclined portion 26, and a second cut start portion 24 are arranged in this order from one end portion W1 to the other end portion W2 in the width direction W of the blade body 121.

[0073] Also, as shown in FIGS. 15 and 16, the cutting edge portions 222, 322 of the blade bodies 221, 321 may not be symmetric with respect to the thickness direction of the blade bodies 221, 321. For example, as shown in FIG. 15, in the cutting edge portion 222 of the blade body 221, the first cut start portion 23 may protrude forward in the moving direction Z from the second cut start portion 24. For example, as shown in FIG. 16, the cutting edge portion 321 of the blade body 322 may have a plurality of first cutting edge inclined portions 25 having different lengths in the width direction W.

[0074] (Embodiment 2) With reference to FIGS. 17 to 19, a motor 70 according to an exemplary embodiment of the present invention will be described. In the following description, the direction parallel to the central axis P of the stator 71 is referred to as the axial direction, the direction orthogonal to the central axis P is referred to as the radial direction, and the direction along an arc centered on the central axis P is referred to as the circumferential direction, respectively. However, this definition of the direction is not intended to limit the orientation of the motor 70 during use.

[0075] As shown in FIG. 17, the motor 70 includes a stator 71 and a rotor 72. The rotor 72 rotates about the central axis P of the stator 71. In the present embodiment, the motor 70 is a so-called inner rotor type motor in which the rotor 72 is rotatably positioned about the central axis P within the cylindrical stator 71. Since the configuration of the rotor 72 is the same as that of a general rotor, the description of the rotor 72 is omitted. Note that in FIG. 17, the stator coil 74 is shown in a simplified manner.

[0076] As shown in FIG. 18, the stator 71 has a stator core 73 and a stator coil 74. FIG. 18 is a perspective view schematically showing an example of the positional relationship between the stator core 73 and the stator coil 74. In FIG. 18, for the sake of explanation, only a part of the plurality of stator coils 74 located in the slots 73b is shown.

[0077] The stator core 73 is cylindrical and extends in the axial direction about the central axis P. As shown in FIG. 18, the stator core 73 has a plurality of teeth 73a arranged in the circumferential direction on the inner circumferential side. The stator core 73 has slots 73b between the circumferentially adjacent teeth 73a. The plurality of slots 73b penetrate the stator core 73 in the axial direction. The stator coil 74 is located in the slot 73b. The stator coil 74 is wound around the teeth 73a in a distributed winding manner.

[0078] As shown in FIGS. 18 and 19, a part of the stator coil 74 wound around the teeth 73a is accommodated in the slot 73b, and a part thereof protrudes from the axial end surface of the stator core 73. The stator coil 74 is composed of a plurality of conducting wires 50.

[0079] As shown in FIG. 19, the wire end portions 50a of the plurality of conducting wires 50 protrude from the axial end surface of the stator core 73. The plurality of conducting wires 50 are electrically connected to each other at the wire end portions 50a protruding from the axial end surface of the stator core 73.

[0080] The configuration of the conducting wire 50 is the same as that in Embodiment 1. That is, the conducting wire 50 has a covered portion 61 whose side surface is covered by the insulating film 52 and an exposed portion 62 whose side surface is exposed without being covered by the insulating film 52. The conducting wire 50 has a stepped portion 63 located between the covered portion 61 and the exposed portion 62. The boundary portion 61a between the stepped portion 63 and the covered portion 61 extends linearly in a direction perpendicular to the extending direction of the conducting wire 50.

[0081] The boundary portion 61a between the stepped portion 63 and the covering portion 61 extends linearly in a direction orthogonal to the extending direction of the conductive wire 50. The conductive wire 50 is formed by a blade tip with a cutting start angle greater than 0 degrees. That is, the exposed portion 62 and the stepped portion 63 of the conductive wire 50 are formed by the film removing device 1. The wire end portion 50a of the conductive wire 50 is obtained by cutting the exposed portion 62 of the conductive wire 50 formed by the film removing device 1 at the central portion in the extending direction of the conductive wire 50.

[0082] That is, the exemplary motor 70 according to the present embodiment is a motor having a stator 71 and a rotor 72. The stator 71 has a stator core 73 having a plurality of slots 73b extending in the axial direction, a conductor 51, and an insulating film 52 covering the conductor 51, and also has a plurality of conductive wires 50 partially accommodated in the plurality of slots 73b. The rotor 72 rotates about the axis of the stator 71. The conductive wire 50 has a covering portion 61 in which the conductor 51 is covered with the insulating film 52, an exposed portion 62 in which the conductor 51 is exposed, and a stepped portion 63 located between the covering portion 61 and the exposed portion 62. The boundary portion between the stepped portion 63 and the covering portion 61 extends linearly in a direction orthogonal to the extending direction of the conductive wire 50.

[0083] In the above-described motor 70, the stepped portion 63 of the conductive wire 50 whose boundary portion 61a with the covering portion 61 is linear is formed by a blade tip with a cutting start angle greater than 0 degrees. That is, the insulating film 52 of the conductive wire 50 is removed by the blade body 21 in which the reduction of the removal accuracy is suppressed. Therefore, in the stator 71, the reduction of the removal accuracy of the insulating film 52 is suppressed. Accordingly, it is possible to obtain the stator 71 in which the insulating film 52 is removed efficiently and with high accuracy.

[0084] (Other Embodiments) As described above, the embodiments of the present invention have been described. However, the above-described embodiments are merely examples for implementing the present invention. Therefore, without being limited to the above-described embodiments, it is possible to appropriately modify and implement the above-described embodiments within the scope not departing from the gist thereof.

[0085] In the first embodiment, when the blade body 21 is viewed in the moving direction Z, the blade body 21 has inclined surfaces 21b at the connection portions between one surface 21a in the thickness direction and the end surfaces on both sides in the width direction W. However, when viewed in the moving direction, the blade body may not have inclined surfaces at the connection portions between one surface in the thickness direction and the end surfaces on both sides in the width direction W.

[0086] In the first embodiment, the punch 2 has a pair of blade bodies 21. However, the punch may have one blade body.

[0087] In the first embodiment, the die 3 is a rectangular shape that is long in a direction intersecting the arrangement direction of the pair of blade bodies 21 when viewed in the moving direction Z of the punch 2. However, the die may be a rectangular shape that is long in the arrangement direction of the pair of blade bodies when viewed in the moving direction. The die may have the same length in the arrangement direction and the direction intersecting the arrangement direction when viewed in the moving direction. The die may not be a rectangular shape when viewed in the moving direction.

[0088] In the first embodiment, the positioning portion 31 is a groove portion 31a that positions the position of the conducting wire 50. However, as long as the positioning portion can position the conducting wire at a predetermined position on the base, it may have other configurations. For example, the positioning portion may be a protruding portion that protrudes from the base of the die and restricts the movement of the conducting wire with respect to the die. The positioning portion may be a fixing member that fixes the conducting wire at a predetermined position on the base of the die.

[0089] In the first embodiment, the inclination angle D23 of the cutting edge tip 23a of the first cutting start portion 23 is 20 degrees. The inclination angle D25 of the cutting edge tip 25a of the first cutting edge inclined portion 25 is 45 degrees. However, if the inclination angle D23 of the cutting edge tip of the first cutting start portion is smaller than the inclination angle D25 of the cutting edge tip of the first cutting edge inclined portion, it may be smaller than 20 degrees or may be larger than 20 degrees. If the inclination angle D25 of the cutting edge tip of the first cutting edge inclined portion is larger than the inclination angle D23 of the cutting edge tip of the first cutting start portion, it may be smaller than 45 degrees or may be larger than 45 degrees. Note that the inclination angle D23 of the cutting edge tip of the first cutting start portion is preferably 20 degrees or more. The inclination angle D25 of the cutting edge tip of the first cutting edge inclined portion is preferably from 45 degrees to 50 degrees.

[0090] In the first embodiment, the inclination angle D24 of the cutting edge tip 24a of the second cutting start portion 24 is 20 degrees. The inclination angle D26 of the cutting edge tip 26a of the second cutting edge inclined portion 26 is 45 degrees. However, if the inclination angle D24 of the cutting edge tip of the second cutting start portion is smaller than the inclination angle D26 of the cutting edge tip of the second cutting edge inclined portion, it may be smaller than 20 degrees or may be larger than 20 degrees. If the inclination angle D26 of the cutting edge tip of the second cutting edge inclined portion is larger than the inclination angle D24 of the cutting edge tip of the second cutting start portion, it may be smaller than 45 degrees or may be larger than 45 degrees. Note that the inclination angle D24 of the cutting edge tip of the second cutting start portion is preferably 20 degrees or more. The inclination angle D26 of the cutting edge tip of the second cutting edge inclined portion is preferably from 45 degrees to 50 degrees.

[0091] The configuration of the motor 70 in the second embodiment is an example of the configuration of a motor in which the conductor 50 from which the insulating film 52 has been removed by the film removing device 1 is used. The configuration of the motor may be any configuration as long as it can use the conductor 50 formed by the film removing device 1 of the first embodiment.

[0092] (Configuration example) Note that the present technology can also have the following configuration.

[0093] (1) The film removing device is a film removing device that removes the insulating film on the side surface of the conducting wire by a punch including a blade body and a die. The punch is movable toward the die. The blade body is a plate shape having a blade tip portion at the front end in the moving direction of the punch. The blade tip portion has a first cut starting portion, a second cut starting portion, at least one first blade tip inclined portion, and at least one second blade tip inclined portion, where the blade tip of the blade tip portion is inclined with respect to the width direction of the blade body when viewed in the thickness direction. The first cut starting portion and the first blade tip inclined portion are arranged in order from one end portion to the other end portion in the width direction of the blade tip portion. The second cut starting portion and the second blade tip inclined portion are arranged in order from the other end portion to the one end portion in the width direction of the blade tip portion. When the blade body is viewed in the thickness direction, the inclination angle of the blade tip of the first cut starting portion with respect to the width direction is smaller than the inclination angle of the blade tip of the first blade tip inclined portion with respect to the width direction. When the blade body is viewed in the thickness direction, the inclination angle of the blade tip of the second cut starting portion with respect to the width direction is smaller than the inclination angle of the blade tip of the second blade tip inclined portion with respect to the width direction.

[0094] (2) In the film removing device according to (1), the length in the width direction of the first cut starting portion is shorter than the length in the width direction of the first blade tip inclined portion. The length in the width direction of the second cut starting portion is shorter than the length in the width direction of the second blade tip inclined portion.

[0095] (3) In the film removing device according to (2), when the blade body is viewed in the thickness direction, the blade tip of the first cut starting portion is inclined with respect to the width direction. When the blade body is viewed in the thickness direction, the blade tip of the first blade tip inclined portion is inclined at an angle of 45 degrees or more with respect to the width direction.

[0096] (4) In the film removing device according to (2) or (3), when the blade body is viewed in the thickness direction, the blade tip of the second cut starting portion is inclined with respect to the width direction. When the blade body is viewed in the thickness direction, the blade tip of the second blade tip inclined portion is inclined at an angle of 45 degrees or more with respect to the width direction.

[0097] (5) In the film removing device according to any one of (1) to (4), the cutting edge portion has other first cutting edge inclined portions and other second cutting edge inclined portions that are alternately arranged in the width direction between the first cutting edge inclined portion adjacent to the first cutting start portion in the width direction and the second cutting edge inclined portion adjacent to the second cutting start portion in the width direction.

[0098] (6) In the film removing device according to any one of (1) to (5), the die has a positioning portion for positioning the position of the conducting wire. The positioning portion positions the conducting wire at a position where the cutting edge portion of the punch overlaps the conductor of the conducting wire as viewed in the moving direction of the punch.

[0099] (7) A film removing method is a film removing method for removing an insulating film on the side surface of a conducting wire by the film removing device according to any one of (1) to (6). The film removing method includes a positioning step of positioning the conducting wire at a position where the cutting edge portion on the blade body of the punch overlaps the conductor of the conducting wire as viewed in the moving direction of the punch by the positioning portion of the die, and an insulating film removing step of removing a predetermined range of the insulating film on the side surface of the conducting wire by the cutting edge portion by moving the punch toward the die. The insulating film removing step includes a first cutting start step of forming a boundary at one end in the longitudinal direction of the side surface of the conducting wire in the predetermined range by the first cutting start portion of the cutting edge portion, a second cutting start step of forming a boundary at the other end in the longitudinal direction of the side surface of the conducting wire in the predetermined range by the second cutting start portion of the cutting edge portion, a first insulating film removing step of removing a portion of the insulating film in the predetermined range that is located on the side of the other end boundary rather than the one end boundary by the first cutting edge inclined portion of the cutting edge portion, and a second insulating film removing step of removing a portion of the insulating film in the predetermined range that is located on the side of the one end boundary rather than the other end boundary by the second cutting edge inclined portion of the cutting edge portion.

[0100] (8) The motor has a stator core having a plurality of slots extending in the axial direction, a conductor, and an insulating film covering the conductor, and a plurality of conducting wires, a part of which is accommodated in the plurality of slots. The motor also has a rotor that rotates about the axis of the stator. The conducting wire has a covered portion where the conductor is covered by the insulating film, an exposed portion where the conductor is exposed, and a stepped portion located between the covered portion and the exposed portion. The boundary portion between the stepped portion and the covered portion extends linearly in a direction perpendicular to the extending direction of the conducting wire.

Industrial Applicability

[0101] It can be used in the manufacture of the stator coil of a motor.

Explanation of Signs

[0102] 1 Film removing device 2 Punch 3 Die 3a Base 21, 121, 221, 322 Blade body 21a One surface in the thickness direction of the blade body 21b Inclined surface 22, 122, 222, 321 Blade tip 23 First cut start portion 23a Blade tip 24 Second cut start portion 24a Blade tip 25 First blade tip inclined portion 25a Blade tip 26 Second blade tip inclined portion 26a Blade tip 31 Positioning portion 31a Groove portion 32 Insertion hole 50 Conducting wire 50a Wire end 51 Conductor 52 Insulating film 61 Covered portion 61a Boundary portion 62 Exposed portion 63 Stepped portion 70 Motor 71 Stator 72 Rotor 73 Stator core 73a Teeth 73b Slots 74 Stator coil D23 Inclination angle of the cutting edge tip of the first cut start portion with respect to the width direction of the blade body D24 Inclination angle of the cutting edge tip of the second cut start portion with respect to the width direction of the blade body D25 Inclination angle of the cutting edge tip of the first cutting edge inclined portion with respect to the width direction of the blade body D26 Inclination angle of the cutting edge tip of the second cutting edge inclined portion with respect to the width direction of the blade body

Claims

1. A film removing device for removing an insulating film on the side surface of a conducting wire by a punch and a die including a blade body, wherein the punch, is movable toward the die, and the blade body, is a plate shape having a blade tip portion at the front end on the front side in the moving direction of the punch, wherein the blade tip portion, has a first cut start portion, a second cut start portion, at least one first blade tip inclined portion, and at least one second blade tip inclined portion, where the blade tip of the blade tip portion is inclined with respect to the width direction of the blade body when viewed in the thickness direction of the blade body, and, the first cut start portion and the first blade tip inclined portion are arranged in order from one end portion to the other end portion in the width direction of the blade tip portion, the second cut start portion and the second blade tip inclined portion are arranged in order from the other end portion to the one end portion in the width direction of the blade tip portion, when the blade body is viewed in the thickness direction, the inclination angle of the blade tip of the first cut start portion with respect to the width direction is, smaller than the inclination angle of the blade tip of the first blade tip inclined portion with respect to the width direction, when the blade body is viewed in the thickness direction, the inclination angle of the blade tip of the second cut start portion with respect to the width direction is, smaller than the inclination angle of the blade tip of the second blade tip inclined portion with respect to the width direction, a film removing device.

2. In the film removing device according to Claim 1, the length in the width direction of the first cut start portion is shorter than the length in the width direction of the first blade tip inclined portion, the length in the width direction of the second cut start portion is shorter than the length in the width direction of the second blade tip inclined portion, a film removing device.

3. In the film removing device according to Claim 2, when the blade body is viewed in the thickness direction, the blade tip of the first cut start portion is inclined with respect to the width direction, when the blade body is viewed in the thickness direction, the blade tip of the first blade tip inclined portion is inclined at an angle of 45 degrees or more with respect to the width direction, a film removing device.

4. In the film removing device according to Claim 2, when the blade body is viewed in the thickness direction, the blade tip of the second cut start portion is inclined with respect to the width direction, when the blade body is viewed in the thickness direction, the blade tip of the second blade tip inclined portion is inclined at an angle of 45 degrees or more with respect to the width direction, a film removing device.

5. In the film removing device according to Claim 1, the blade tip portion, Between the first cutting edge inclined portion adjacent in the width direction to the first cutting start portion and the second cutting edge inclined portion adjacent in the width direction to the second cutting start portion, there are other first cutting edge inclined portions and other second cutting edge inclined portions arranged alternately in the width direction. Film removing device.

6. In the film removing device according to claim 1, The die has A positioning portion for positioning the position of the conducting wire, The positioning portion Positions the conducting wire at a position where the cutting edge portion of the punch overlaps with the conductor of the conducting wire as viewed in the moving direction of the punch. Film removing device.

7. A film removing method for removing an insulating film on the side surface of a conducting wire by the film removing device according to any one of claims 1 to 6, A positioning step of positioning the conducting wire by the positioning portion of the die at a position where the cutting edge portion of the punch overlaps with the conductor of the conducting wire as viewed in the moving direction of the punch, An insulating film removing step of removing a predetermined range of the insulating film on the side surface of the conducting wire by the cutting edge portion by moving the punch toward the die, having The insulating film removing step A first cutting start step of forming a boundary at one end in the longitudinal direction of the side surface of the conducting wire in the predetermined range by the first cutting start portion of the cutting edge portion, A second cutting start step of forming a boundary at the other end in the longitudinal direction of the side surface of the conducting wire in the predetermined range by the second cutting start portion of the cutting edge portion, A first insulating film removing step of removing a portion of the insulating film in the predetermined range that is located on the boundary side of the other end rather than the boundary of one end by the first cutting edge inclined portion of the cutting edge portion, A second insulating film removing step of removing a portion of the insulating film in the predetermined range that is located on the boundary side of one end rather than the boundary of the other end by the second cutting edge inclined portion of the cutting edge portion, A film removing method having.

8. A stator core having a plurality of slots extending in the axial direction, A conductor and an insulating film covering the conductor, and a plurality of conducting wires partially accommodated in the plurality of slots, A stator having A rotor rotating about the axis of the stator, A motor having The conducting wire A covered portion where the conductor is covered by the insulating film, An exposed portion where the conductor is exposed, A stepped portion located between the covered portion and the exposed portion, having The boundary portion between the stepped portion and the covering portion extends linearly in a direction orthogonal to the extending direction of the conducting wire. Motor.

Images